ai.grakn.migration.base

Class Migrator

java.lang.Object

ai.grakn.migration.base.Migrator

public class Migrator
extends Object

Abstract migrator class containing methods and functionality needed by all extending migrator classes.

Author:

alexandraorth

Field Summary

Fields

Modifier and Type	Field and Description
static int	ACTIVE_TASKS
static int	BATCH_SIZE
static int	DEFAULT_MAX_RETRY

Method Summary

Modifier and Type	Method and Description
void	load(String template, java.util.stream.Stream<Map<String,Object>> converter) Migrate data constrained by this migrator using a loader configured by the provided parameters.
void	load(String template, java.util.stream.Stream<Map<String,Object>> converter, int batchSize, int numberActiveTasks, int retrySize, boolean debug) Migrate data constrained by this migrator using a loader configured by the provided parameters.
void	print(String template, java.util.stream.Stream<Map<String,Object>> converter) Template the data and print to standard out.
Migrator	registerMacro(ai.grakn.graql.macro.Macro macro) Register a macro to use in templating
protected java.util.stream.Stream<ai.grakn.graql.Query>	template(String template, Map<String,Object> data)
static Migrator	to(String uri, ai.grakn.Keyspace keyspace)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

BATCH_SIZE

public static final int BATCH_SIZE

See Also:

Constant Field Values

ACTIVE_TASKS

public static final int ACTIVE_TASKS

See Also:

Constant Field Values

DEFAULT_MAX_RETRY

public static final int DEFAULT_MAX_RETRY

See Also:

Constant Field Values

Method Detail

to

public static Migrator to(String uri,
                          ai.grakn.Keyspace keyspace)

registerMacro

public Migrator registerMacro(ai.grakn.graql.macro.Macro macro)

Register a macro to use in templating

load

public void load(String template,
                 java.util.stream.Stream<Map<String,Object>> converter)

Migrate data constrained by this migrator using a loader configured by the provided parameters. Uses the default batch size and number of active tasks. NOTE: Currently only used for testing purposes

Parameters:

template -

converter -

print

public void print(String template,
                  java.util.stream.Stream<Map<String,Object>> converter)

Template the data and print to standard out.

Parameters:

template -

converter -

load

public void load(String template,
                 java.util.stream.Stream<Map<String,Object>> converter,
                 int batchSize,
                 int numberActiveTasks,
                 int retrySize,
                 boolean debug)

Migrate data constrained by this migrator using a loader configured by the provided parameters.

Parameters:

template -

converter -

batchSize - The number of queries to execute in one transaction. Default is 25.

numberActiveTasks - Number of tasks running on the server at any one time. Consider this a safeguard to bot the system load. Default is 25.

retrySize - If the Loader should continue attempt to send tasks when Engine is not available or an exception occurs

template

protected java.util.stream.Stream<ai.grakn.graql.Query> template(String template,
                                                                 Map<String,Object> data)

Parameters:

template - a string representing a templated graql query

data - data used in the template

Returns:

an insert query